Redefine {un}register_hotcpu_notifier() !HOTPLUG_CPU stubs
The return of the present "do {} while" based stub definition of
register_hotcpu_notifier() cannot be checked. This makes the stub
asymmetric w.r.t. the real HOTPLUG_CPU=y implementation that is
int-returning. So let us redefine this to be consistent with the full
version. Also do the same for unregister_hotcpu_notifier().
We cannot define these as static inline functions due to an existing GCC
bug (#33172). So define as macros that return appropriately instead (int
'0' for the register_hotcpu_notifier case and void for
unregister_hotcpu_notifier).
Signed-off-by: Satyam Sharma <satyam@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 0ad72c4c..b79c575 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -119,8 +119,9 @@
#define lock_cpu_hotplug() do { } while (0)
#define unlock_cpu_hotplug() do { } while (0)
#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
-#define register_hotcpu_notifier(nb) do { (void)(nb); } while (0)
-#define unregister_hotcpu_notifier(nb) do { (void)(nb); } while (0)
+/* These aren't inline functions due to a GCC bug. */
+#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
+#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
static inline int cpu_is_offline(int cpu) { return 0; }